Merge pull request #421 from nazar-pc/shadowRoot.getSelection-fix

`shadowRoot.getSelection()` method added since it is present in Chromium

src/ShadowDOM/wrappers/Selection.js

@@ -46,7 +46,9 @@
       unsafeUnwrap(this).removeRange(unwrap(range));
     },
     selectAllChildren: function(node) {
-      unsafeUnwrap(this).selectAllChildren(unwrapIfNeeded(node));
+      unsafeUnwrap(this).selectAllChildren(
+          node instanceof ShadowRoot ? unsafeUnwrap(node.host) : unwrapIfNeeded(node)
+      );
     },
     toString: function() {
       return unsafeUnwrap(this).toString();

src/ShadowDOM/wrappers/ShadowRoot.js

@@ -68,6 +68,10 @@
     elementFromPoint: function(x, y) {
       return elementFromPoint(this, this.ownerDocument, x, y);
     },
+
+    getSelection: function() {
+      return document.getSelection();
+    }
   });
 
   scope.wrappers.ShadowRoot = ShadowRoot;

tests/ShadowDOM/js/ShadowRoot.js

@@ -36,6 +36,30 @@ suite('ShadowRoot', function() {
     assert.equal(sr2.elementFromPoint(5, 5), null);
   });
 
+  test('getSelection', function() {
+    div = document.body.appendChild(document.createElement('div'));
+    var sr = div.createShadowRoot();
+    sr.innerHTML = '<a>a</a><b>b</b><c>c</c>';
+
+    var selection = sr.getSelection();
+    selection.selectAllChildren(sr);
+
+    assert.equal(selection.toString(), 'abc');
+
+    assert.isFalse(selection.isCollapsed);
+    assert.equal(selection.rangeCount, 1);
+
+    // https://code.google.com/p/chromium/issues/detail?id=336821
+    if (/WebKit/.test(navigator.userAgent))
+      return;
+
+    assert.equal(selection.anchorNode, div);
+    assert.equal(selection.anchorOffset, 0);
+
+    assert.equal(selection.focusNode, div);
+    assert.equal(selection.focusOffset, 3);
+  });
+
   test('olderShadowRoot', function() {
     var host = document.createElement('div');
     host.innerHTML = '<a>a</a><b>b</b>';